[meta-freescale] [meta-fsl-ppc]: Enable gpio expander for p2041?

[Zhenhua Luo]

I just got the comments from SDK developer, there is no such node in upstream, he thinks it should be a I2C node, not a GPIO node.

Sorry for the confusion. 


Best Regards,

Zhenhua 

> -----Original Message-----
> From: meta-freescale-bounces at yoctoproject.org [mailto:meta-freescale-
> bounces at yoctoproject.org] On Behalf Of Zhenhua Luo
> Sent: Thursday, March 10, 2016 4:26 PM
> To: Nora Björklund <Nora.Bjorklund at enea.com>
> Cc: meta-freescale at yoctoproject.org
> Subject: Re: [meta-freescale] [meta-fsl-ppc]: Enable gpio expander for p2041?
> 
> https://git.kernel.org/cgit/linux/kernel/git/powerpc/linux.git/tree/arch/power
> pc/boot/dts/fsl/p2041si-post.dtsi#n395
> 
> 
> Best Regards,
> 
> Zhenhua
> 
> > -----Original Message-----
> > From: Nora Björklund [mailto:Nora.Bjorklund at enea.com]
> > Sent: Wednesday, March 09, 2016 8:35 PM
> > To: Zhenhua Luo <zhenhua.luo at nxp.com>
> > Cc: meta-freescale at yoctoproject.org
> > Subject: Re: [meta-freescale] [meta-fsl-ppc]: Enable gpio expander for p2041?
> >
> > Hi Zhenhua,
> >
> > Thanks for the reply. Which upstream kernel was the expander merged into?
> >
> > I was looking in
> > git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git and in
> > git://git.freescale.com/ppc/sdk/linux.git but did not find the gpio- expander.
> >
> > Best Regards,
> > Nora
> >
> > On Wed, 2016-03-09 at 09:52 +0000, Zhenhua Luo wrote:
> > > Hi Nora,
> > >
> > > The PCA9672 is a GPIO expander chip via I2C bus, and no any relative
> > > with P2041 GPIO IP block.
> > >
> > > P2041 dts file has included the GPIO node in both upstream kernel
> > > and
> > > SDK2.0 which will be released in 2016 Q2.
> > >
> > >
> > > Best Regards,
> > >
> > > Zhenhua
> > >
> > > >
> > > > -----Original Message-----
> > > > From: meta-freescale-bounces at yoctoproject.org [mailto:meta-
> > > > freescale-
> > > > bounces at yoctoproject.org] On Behalf Of Nora Bj?rklund
> > > > Sent: Monday, March 07, 2016 9:25 PM
> > > > To: meta-freescale at yoctoproject.org
> > > > Subject: [meta-freescale] [meta-fsl-ppc]: Enable gpio expander for
> > > > p2041?
> > > >
> > > > Hi all,
> > > >
> > > > I was working on a p2041rdb target not so long ago and needed to
> > > > use the gpio pins (described in detail in the p2041 reference
> > > > manual), these are visible on the p2041 fact sheet [1]. The pins
> > > > are connected to a gpio expander, PCA9672 [2], which is connected
> > > > to an i2c-bus.
> > > >
> > > > The expander was not available in the device-tree for p2041rdb so
> > > > I patched it locally to include it. The gpio-expander does not
> > > > seem to be available in any upstream repository either (at this
> > > > time I was working on a version of the 3.12 kernel).
> > > >
> > > > Would this patch be of any interest for meta-fsl-ppc?
> > > >
> > > > The gpio pins are there on all p2041rdb targets (at least since
> > > > they are mentioned as such in the reference guide), so I could not
> > > > come up with a reason to why it is excluded from the device tree.
> > > >
> > > > Best Regards,
> > > > Nora Björklund
> > > >
> > > > -----------------------------
> > > > [1] http://cache.nxp.com/files/32bit/doc/fact_sheet/P2041RDBFS.pdf?
> > > > fpsp
> > > >
> >
> =1&WT_TYPE=Fact%20Sheets&WT_VENDOR=FREESCALE&WT_FILE_FORMAT=
> > > > pdf&WT_ASSE
> > > > T=Documentation&fileExt=.pdf (login might be required) [2]
> > > > http://www.nxp.com/products/interface-and-connectivity/interface-a
> > > > n
> > > > d-system-management/i2c/i2c-general-purpose-i-o/remote-8-bit-i-o-
> > > > expander-for-fm-plus-ic-bus-with-interrupt-and-reset:PCA9672
> > > > --
> > > > _______________________________________________
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> > > > meta-freescale at yoctoproject.org
> > > > https://lists.yoctoproject.org/listinfo/meta-freescale
> --
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